
package com.itheima.filter;

import com.itheima.utils.CurrentHolder;
import com.itheima.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.annotation.WebFilter;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
@Slf4j
@WebFilter(urlPatterns = "/*")
public class TokenFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取到请求路径
        String path = request.getRequestURI();
        //判断是否是登录请求,如果路径中包含/login,则放行
        if (path.contains("/login")) {
            filterChain.doFilter(request, response);
            return;
        }
        //获取请求头中的token
        String token = request.getHeader("token");
        //判断token是否存在,如果不存在,则返回错误信息
        if (token == null) {
            log.info("请求头中缺少token");
            response.setStatus(401);
            return;
        }
        //如果token存在,校验令牌,如果校验失败,则返回错误信息
        if (token != null) {
            try {
                Claims claims = JwtUtils.parseJWT(token);
                //获取id
                Integer empId = (Integer) claims.get("id");
                log.info("当前用户id为:{}",empId);
                //将用户id存进ThreadLocal
                CurrentHolder.setCurrentId(empId);
                log.info("令牌校验通过");
            }
            catch (Exception e) {
                log.info("令牌校验失败");
                response.setStatus(401);
                return;
            }
        }
        //校验通过,放行
        filterChain.doFilter(request, response);
    }

    @Override
    public void destroy() {
        Filter.super.destroy();
    }
}
